Based on sound reasoning or evidence:
— Well-founded suspicions.
synonym: tenable.
Roget 1:
existing
etc.
v.;
existent,
under the sun;
in existence
etc.
n.;
extant;
afloat,
afoot,
on foot,
current,
prevalent;
undestroyed.
real,
actual,
positive,
absolute;
true
etc.
494;
substantial,
substantive;
self-existing,
self-existent;
essential.
well-founded,
well-grounded;
unideal†,
unimagined;
not potential
etc.
2;
authentic.
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Roget 472:
probable,
likely,
hopeful,
to be expected,
in a fair way.
plausible,
specious,
ostensible,
colorable,
ben trovato [It],
well-founded,
reasonable,
credible,
easy of belief,
presumable,
presumptive,
apparent.
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Roget 474:
certain,
sure,
assured
etc.
v.;
solid,
well-founded.
unqualified,
absolute,
positive,
determinate,
definite,
clear,
unequivocal,
categorical,
unmistakable,
decisive,
decided,
ascertained.
inevitable,
unavoidable,
avoidless†;
ineluctable.
unerring,
infallible;
unchangeable
etc.
150;
to be depended on,
trustworthy,
reliable,
bound.
unimpeachable,
undeniable,
unquestionable;
indisputable,
incontestable,
incontrovertible,
indubitable;
irrefutable
etc.
(proven)
478;
conclusive,
without power of appeal.
indubious†;
without doubt,
beyond a doubt,
without a shade or shadow of doubt,
without question,
beyond question;
past dispute;
clear as day;
beyond all question,
beyond all dispute;
undoubted,
uncontested,
unquestioned,
undisputed;
questionless†,
doubtless.
authoritative,
authentic,
official.
sure as fate,
sure as death and taxes,
sure as a gun.
evident,
self-evident,
axiomatic;
clear,
clear as day,
clear as the sun at noonday.
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Polish: zrozumiały, usprawiedliwiony